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01/31/10 22:41
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#172825 - very small components are not recommended
Responding to: ???'s previous message
24VDC
480VAC --- fuse ---resistor ---*---------*-----*------*---- regulator
                               |         |     |      |
                           transient    zener  |      |
                          suppressor          |      |
                               |              |    reverse
                               |              |    biased
                               |              |     diode
                               |             SCR      |
                               |              |       |
gnd ---------------------------*--------------*-------*

the resistor shall be as large as can be without malfunction at whatever the lowest actual 24V can be
the SCR and the diode shall be capable of pulling the current the resistor allows at 480V.

While very small components are not recommended the heating of the components will be brief and thus they can be reated for less than the wattage they would need to handle if the fuse did not blow.

Erik

PS this will prothect your thingy, but if the 24V is a battery it will explode if 480VAC is shorted to it

List of 12 messages in thread
TopicAuthorDate
LM2574-5 AC voltage protection            01/01/70 00:00      
   of course not            01/01/70 00:00      
   no AC protection            01/01/70 00:00      
      Thank you both            01/01/70 00:00      
         fire brigade            01/01/70 00:00      
            suggestions?            01/01/70 00:00      
               something like this            01/01/70 00:00      
               already made            01/01/70 00:00      
                  just one more thing            01/01/70 00:00      
                  thank you            01/01/70 00:00      
                     It is very difficult...            01/01/70 00:00      
                     very small components are not recommended            01/01/70 00:00      

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